/*
 * Copyright 2016 Code Above Lab LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.codeabovelab.dm.cluman.cluster.filter;

import java.util.function.Predicate;

/**
 * Function for image filtration.
 */
public interface Filter extends Predicate<Object> {

    static Filter any() {
        return  new Filter() {
            @Override
            public boolean test(Object o) {
                return true;
            }

            @Override
            public String getExpression() {
                return FilterFactory.ANY;
            }
        };
    }

    static Filter noOne() {
        return new Filter() {
            @Override
            public boolean test(Object o) {
                return false;
            }

            @Override
            public String getExpression() {
                return FilterFactory.NO_ONE;
            }
        };
    }

    default String getExpression() {
        return null;
    }
}
